Adding a heat map for slabs with a contour map export would be useful. Export to to .dwg or straight to .pdf allowing for the import of a .dwg or .pdf background would allow for a quicker workflow than having to bring things into Revit and use APL. Also, adjusting the origin elevation would be a nice feature to allow the user to find the most economical cut/fill scenario. Going one step further, allowing the software to find the best cut/fill scenario to get a slab back within tolerance would be an added bonus, though there'd have to be an adjustable assumption on the cost ratio between the two.